36 The entrance is _____ with such heavystones as two or three big men can’t move

She is a kind-hearted teacher and is _____ to the students. [ ]

With his lips still _______ ，he couldn’t say a word．

Excuse me, Mr Li, I don’t know the meaning of the whole sentence. What shall I doYou should _____ .

________ your report, what is most important to protect our environment ?